Jack London Square, 409 Water St, Oakland, CA 94607, USA
Get the kids out on the water learning how to paddle and kayak with California Canoe and Kayak. They're located right in Jack London Square.
If you paddle in the morning, you could come off the water and have lunch right there. Plank would be a good spot. They have outdoor seating with bocce ball courts and cornhole games for the kids to play around with until lunch comes.